Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
hieu lang » chieu sang, hieu quang, nhieu tang
hanh hang » thanh hang, hang hang, hanh han
cong doan » cong dan, cong hoan, dong doanh
va thong » va thuong, va phuong, he thong
ho hieu » ho chieu, hoi hieu, nho hieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - hanh hang va thong ((cong doan) or (doanh doanh)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh hang va thong ((cong doan) OR (doanh doanh)) van ban.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh hang va thong ((cong doan) or (doanh doanh)) van ban*.